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Implement lifetime elision for Foo(...) -> ... type sugar.
This means that `Fn(&A) -> (&B, &C)` is equivalent to `for<'a> Fn(&'a A) -> (&'a B, &'a C)` similar to the lifetime elision of lower-case `fn` in types and declarations. Closes #18992.
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src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// Test that the unboxed closure sugar can be used with an arbitrary | ||
// struct type and that it is equivalent to the same syntax using | ||
// angle brackets. This test covers only simple types and in | ||
// particular doesn't test bound regions. | ||
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#![feature(unboxed_closures)] | ||
#![allow(dead_code)] | ||
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trait Foo<T,U> { | ||
fn dummy(&self, t: T, u: U); | ||
} | ||
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trait Eq<Sized? X> for Sized? { } | ||
impl<Sized? X> Eq<X> for X { } | ||
fn eq<Sized? A,Sized? B:Eq<A>>() { } | ||
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fn main() { | ||
eq::< for<'a> Foo<(&'a int,), &'a int>, | ||
Foo(&int) -> &int >(); | ||
eq::< for<'a> Foo<(&'a int,), (&'a int, &'a int)>, | ||
Foo(&int) -> (&int, &int) >(); | ||
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let _: Foo(&int, &uint) -> &uint; //~ ERROR missing lifetime specifier | ||
} |